First of all you are beautiful. You just need to know a few basic tips when taking photos.

These tips, will improve your photos:

Golden ratio is pretty simpel way to improve your photos, the easiest way is try to have the main subject of your photo fill out 1/3 of the picture.

Choose a interesting background. I like the photo with the mountain.

If you look at portrait photography most of the backgrounds are blur. With that, the viewer get forced too look at the model. With a dslr it's pretty simple trick to make you photos look great.

Try to compose your photos. Try different angel, all pictures of you were taken from eye level and you are always standing in the middle. Try that all the main focus is at the model.

If I were the photograph, I would let stand my model near the field, the mountains as a background. I would try, that only the Field, the mountain and the model is on the Picture.